Cooperation of earthworm and arbuscular mycorrhizae enhanced plant N uptake by balancing absorption and supply of ammonia

	Cooperation of earthworm and arbuscular mycorrhizae enhanced plant N uptake by balancing absorption and supply of ammonia
	He, Xinxing; Chen, Yuanqi; Liu, Shengjie; Gunina, Anna; Wang, Xiaoli; Chen, Weili; Shao, Yuanhu; Shi, Leilei; Yao, Qing; Li, Jianxiong
刊名	SOIL BIOLOGY & BIOCHEMISTRY
	2018
卷号	116 期号:x 页码:351-359
关键词	Biological Invasion Understory Plant n Availability Symbiosis Decomposer
英文摘要	Earthworms and arbuscular mycorrhizal fungi (AMF) interact to regulate plant nitrogen (N) supply, but the mechanisms through which they affect plant N uptake are unclear. We hypothesized that earthworms, plants and the associated AMF exhibit different preferences for different forms of inorganic N (NH4 and NO3-), which could regulate the effect of earthworms and AMF interaction on plant N acquisition. We outlined three independent but complementary experiments to test this hypothesis in the context of exotic earthworm, Pontoscolex corethrurus. The earthworm is dominating the plantation forests in subtropical and tropical regions of China, which have their understory dominated by the fern Dicranopteris dichotoma. By employing an excised root N-15 incubation experiment and a field in situ 15N experiment, we found that the fern prefers to use NH4 rather than NO3-. Then we did a 2 x 2 factorial microcosm experiment using AMF (Rhizophagus intraradices) and earthworms (P. corethrunis). The exotic earthworm increased soil NH4 concentration but did not affect soil NO3- concentration, while the AMF decreased soil NH4 concentration but had no effect on soil NO3- concentration. The increase in soil NH4 induced by the earthworms was efficiently utilized by the AMF, and significantly increased the total N uptake by the fern. In contrast, the AMF alone increased the N concentration of leaves and coarse roots, but not the total plant N uptake, primarily due to the lower levels of available NH4 compared with the earthworm treatments. The uninoculated fern did not benefit from the earthworm-induced increase in soil NH4, suggesting that the root of the fern cannot access the 'NH4 hotspots' created by the earthworms. Our work suggests that successful cooperation of earthworms and AMF on plant N uptake depends on the correct match in N-form.
URL标识	查看原文
语种	英语
公开日期	2018-02-09
内容类型	期刊论文
源URL	[http://ir.xtbg.org.cn/handle/353005/10710]
专题	西双版纳热带植物园_其他
推荐引用方式 GB/T 7714	He, Xinxing,Chen, Yuanqi,Liu, Shengjie,et al. Cooperation of earthworm and arbuscular mycorrhizae enhanced plant N uptake by balancing absorption and supply of ammonia[J]. SOIL BIOLOGY & BIOCHEMISTRY,2018,116(x):351-359.
APA	He, Xinxing.,Chen, Yuanqi.,Liu, Shengjie.,Gunina, Anna.,Wang, Xiaoli.,...&Fu, Shenglei.(2018).Cooperation of earthworm and arbuscular mycorrhizae enhanced plant N uptake by balancing absorption and supply of ammonia.SOIL BIOLOGY & BIOCHEMISTRY,116(x),351-359.
MLA	He, Xinxing,et al."Cooperation of earthworm and arbuscular mycorrhizae enhanced plant N uptake by balancing absorption and supply of ammonia".SOIL BIOLOGY & BIOCHEMISTRY 116.x(2018):351-359.